[turbofan] Avoid shadowing of local variables.

Cleanup fix addressing the comment on crrev.com/2325943002.

TBR=jarin@chromium.org,brucedawson@chromium.org

Review-Url: https://codereview.chromium.org/2335083002
Cr-Commit-Position: refs/heads/master@{#39364}

src/compiler/js-inlining-heuristic.cc

@@ -197,7 +197,7 @@ Reduction JSInliningHeuristic::InlineCandidate(Candidate const& candidate) {
   Node* calls[kMaxCallPolymorphism + 1];
   Node* if_successes[kMaxCallPolymorphism];
   Node* callee = NodeProperties::GetValueInput(node, 0);
-  Node* control = NodeProperties::GetControlInput(node);
+  Node* fallthrough_control = NodeProperties::GetControlInput(node);
 
   // Setup the inputs for the cloned call nodes.
   int const input_count = node->InputCount();
@@ -212,11 +212,12 @@ Reduction JSInliningHeuristic::InlineCandidate(Candidate const& candidate) {
     if (i != (num_calls - 1)) {
       Node* check =
           graph()->NewNode(simplified()->ReferenceEqual(), callee, target);
-      Node* branch = graph()->NewNode(common()->Branch(), check, control);
-      control = graph()->NewNode(common()->IfFalse(), branch);
+      Node* branch =
+          graph()->NewNode(common()->Branch(), check, fallthrough_control);
+      fallthrough_control = graph()->NewNode(common()->IfFalse(), branch);
       if_successes[i] = graph()->NewNode(common()->IfTrue(), branch);
     } else {
-      if_successes[i] = control;
+      if_successes[i] = fallthrough_control;
     }
 
     // The first input to the call is the actual target (which we specialize
@@ -243,19 +244,20 @@ Reduction JSInliningHeuristic::InlineCandidate(Candidate const& candidate) {
       if_exceptions[i] =
           graph()->NewNode(common()->IfException(), calls[i], calls[i]);
     }
-    Node* control =
+    Node* exception_control =
         graph()->NewNode(common()->Merge(num_calls), num_calls, if_exceptions);
-    if_exceptions[num_calls] = control;
-    Node* effect = graph()->NewNode(common()->EffectPhi(num_calls),
-                                    num_calls + 1, if_exceptions);
-    Node* value = graph()->NewNode(
+    if_exceptions[num_calls] = exception_control;
+    Node* exception_effect = graph()->NewNode(common()->EffectPhi(num_calls),
+                                              num_calls + 1, if_exceptions);
+    Node* exception_value = graph()->NewNode(
         common()->Phi(MachineRepresentation::kTagged, num_calls), num_calls + 1,
         if_exceptions);
-    ReplaceWithValue(if_exception, value, effect, control);
+    ReplaceWithValue(if_exception, exception_value, exception_effect,
+                     exception_control);
   }
 
   // Morph the call site into the dispatched call sites.
-  control =
+  Node* control =
       graph()->NewNode(common()->Merge(num_calls), num_calls, if_successes);
   calls[num_calls] = control;
   Node* effect =